写出除去下列气体中少量杂质(括号内物质)的方法: ⑴N2(O2);⑵NO(NO2

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问题:

写出除去下列气体中少量杂质(括号内物质)的方法:

⑴N2(O2                      ;⑵NO(NO2                          

⑶CO2(HCl)                     ;⑷NH3(H2O)                         

考点:单质磷及其化合物氮气二氧化氮
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第Ⅱ卷

第四部分:书面表达(共两节,满分40分)

第一节完成句子(共10小题,每小题1.5分,满分l5分)

阅读下列各小题,根据括号内的汉语提示,用句末内的英语单词完成句子。

71.__________(尽管雨下得很大), they didn't cancel the football match. (as)

72. In London the huge clock____________(被称为)" Big Ben" is a major tourist attraction.    (refer)

73.___________(在国外长大) ,he couldn't speak Chinese well. (bring)

74. Jenny sat motionless ,listening to the teacher with_______(心不在焉). (wander)

75. He was upset about the constant noise,___________(不能将注意力集中在工作上).    (unable, centre)

76. Jack_________(和他的父亲就这件事发生意见分歧),which made both of them very    unhappy. (differ)

77.___________(除了熟悉中国的历史),Ben knows a lot about Chinese geography. (apart)

78. He__________(连续三次进行了尝试), and eventually succeeded at the third attempt.     (attempt)

79. ____________(患心脏病) for many years, he takes his medicine wherever he goes. (suffer)

80. By last Friday his money __________(由于失业而用完了) unemployment. (run, consequence)

题型:填空题

When he ________ home, he saw his mother           the room.

A.got back; clean

B.got on; cleaning

C.got at; clean

D.got back; cleaning

题型:填空题
如图所示,处在磁感应强度为B的匀强磁场中的单匝矩线圈abcd,以恒定的角速度ω绕ab边转动,磁场方向垂直于纸面向里,线圈所围面积为S,线圈导线的总电阻为R.t=0时刻线圈平面与纸面重合,且cd边正在离开纸面向外运动.则正确的是(  )

A.时刻t线圈中电流的瞬时值icosωt

B.线圈中电流的有效值I

C.线圈中电流的有效值I=

D.线圈消耗的电功率P

题型:填空题

某企业对已售出商品提供一年售后保修服务,应当确认为一项负债。

题型:填空题

管式泵在下泵时()。

A.工作筒与油管相连,活塞与抽油杆连接

B.工作筒与活塞都与油管连接

C.工作筒与活塞都与抽油杆连接

D.工作筒与抽油杆连接,活塞与油管连接

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